+ dnl Including <GL/glut.h> instead of plain <GL/gl.h> avoids problems on
+ dnl platforms like WinDoze where special headers like <windows.h> or
+ dnl some macro trickery would be needed
+ FPTOOLS_SEARCH_LIBS([#include <GL/glut.h>], glEnd, $GL_search_list, have_GL=yes, have_GL=no)
+
+ dnl TODO: The tests for GL features should better be cascaded and the
+ dnl results should be cached. A new macro would be helpful here.
+
+ AC_MSG_CHECKING(glTexSubImage1D)
+ AC_TRY_LINK([#include <GL/glut.h>],
+ [glTexSubImage1D(GL_TEXTURE_1D,0,0,2,GL_INTENSITY,GL_BYTE,(void*)0)],
+ fptools_gl_texsubimage1d=yes,
+ fptools_gl_texsubimage1d=no);
+ AC_MSG_RESULT($fptools_gl_texsubimage1d)
+
+ AC_MSG_CHECKING(glDrawRangeElements)
+ AC_TRY_LINK([#include <GL/glut.h>],
+ [glDrawRangeElements(GL_QUADS,0,0,0,GL_UNSIGNED_BYTE,(void*)0)],
+ fptools_gl_drawrangeelements=yes,
+ fptools_gl_drawrangeelements=no);
+ AC_MSG_RESULT($fptools_gl_drawrangeelements)
+
+ AC_MSG_CHECKING(glActiveTexture)
+ AC_TRY_LINK([#include <GL/glut.h>],
+ [glActiveTexture(GL_TEXTURE1)],
+ fptools_gl_activetexture=yes,
+ fptools_gl_activetexture=no);
+ AC_MSG_RESULT($fptools_gl_activetexture)
+
+ AC_MSG_CHECKING(glMultiDrawArrays)
+ AC_TRY_LINK([#include <GL/glut.h>],
+ [glMultiDrawArrays(GL_TRIANGLES, (GLint*)0, (GLsizei*)0, 0)],
+ fptools_gl_multidrawarrays=yes,
+ fptools_gl_multidrawarrays=no);
+ AC_MSG_RESULT($fptools_gl_multidrawarrays)
+
+ if test x"$fptools_gl_texsubimage1d" != xyes; then
+ fptools_gl_version=1.0
+ else
+ if test x"$fptools_gl_drawrangeelements" != xyes; then
+ fptools_gl_version=1.1
+ else
+ if test x"$fptools_gl_activetexture" != xyes; then
+ fptools_gl_version=1.2
+ else
+ if test x"$fptools_gl_multidrawarrays" != xyes; then
+ fptools_gl_version=1.3
+ else
+ fptools_gl_version=1.4
+ fi
+ fi
+ fi
+ fi
+ echo "It looks like GL version ${fptools_gl_version}"
+
+ dnl TODO: Cache the results of the tests for the imaging subset.
+
+ AC_MSG_CHECKING(EXT_blend_color)
+ AC_TRY_LINK([#include <GL/glut.h>],
+ [glBlendColorEXT((GLclampf)0.0,(GLclampf)0.0,(GLclampf)0.0,(GLclampf)0.0)],
+ hopengl_EXT_blend_color=yes,
+ hopengl_EXT_blend_color=no);
+ AC_MSG_RESULT($hopengl_EXT_blend_color)
+
+ AC_MSG_CHECKING(EXT_blend_minmax)
+ AC_TRY_LINK([#include <GL/glut.h>],
+ [glBlendEquationEXT(GL_FUNC_ADD_EXT)],
+ hopengl_EXT_blend_minmax=yes,
+ hopengl_EXT_blend_minmax=no);
+ AC_MSG_RESULT($hopengl_EXT_blend_minmax)
+
+ AC_MSG_CHECKING(EXT_blend_subtract)
+ AC_TRY_LINK([#include <GL/glut.h>],
+ [glBlendEquationEXT(GL_FUNC_SUBTRACT_EXT)],
+ hopengl_EXT_blend_subtract=yes,
+ hopengl_EXT_blend_subtract=no);
+ AC_MSG_RESULT($hopengl_EXT_blend_subtract)
+
+ FPTOOLS_SEARCH_LIBS([#include <GL/glu.h>], gluNewQuadric, $GLU_search_list, have_GLU=yes, have_GLU=no)
+
+ dnl TODO: Cascade and cache...
+
+ AC_MSG_CHECKING(gluGetString)
+ AC_TRY_LINK([#include <GL/glut.h>],
+ [gluGetString(GLU_EXTENSIONS)],
+ fptools_glu_getstring=yes,
+ fptools_glu_getstring=no);
+ AC_MSG_RESULT($fptools_glu_getstring)
+
+ AC_MSG_CHECKING(gluTessEndPolygon)
+ AC_TRY_LINK([#include <GL/glut.h>],
+ [gluTessEndPolygon((GLUtesselator*)0)],
+ fptools_glu_tessendpolygon=yes,
+ fptools_glu_tessendpolygon=no);
+ AC_MSG_RESULT($fptools_glu_tessendpolygon)
+
+ AC_MSG_CHECKING(gluUnProject4)
+ AC_TRY_LINK([#include <GL/glut.h>],
+ [gluUnProject4(0.0,0.0,0.0,0.0,(GLdouble*)0,(GLdouble*)0,(GLint*)0,0.0,0.0,(GLdouble*)0,(GLdouble*)0,(GLdouble*)0,(GLdouble*)0)],
+ fptools_glu_unproject4=yes,
+ fptools_glu_unproject4=no);
+ AC_MSG_RESULT($fptools_glu_unproject4)
+
+ if test x"$fptools_glu_getstring" != xyes; then
+ fptools_glu_version=1.0
+ else
+ if test x"$fptools_glu_tessendpolygon" != xyes; then
+ fptools_glu_version=1.1
+ else
+ if test x"$fptools_glu_unproject4" != xyes; then
+ fptools_glu_version=1.2
+ else
+ fptools_glu_version=1.3
+ fi
+ fi
+ fi
+ echo "It looks like GLU version ${fptools_glu_version}"
+